JP2007231635A - Position measuring method for jacking method and its apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To immediately and three-dimensionally measure bending angles and directions of connected jacking pipes and measure a position of the whole jacking pipe by distances from each measuring point. <P>SOLUTION: A measuring wire 5 with one end fixed to a rear part of an excavator 1 and with the other end passing through a plurality of the jacking pipes to which a tensile force is applied in a starting shaft 3 is provided in a jacking method. The measuring wire 5 is supported on a plurality of positions in the jacking pipes 2 and each support is supported by supporting bodies 7 which allow the measuring wire 5 to loosely pass therethrough. Gauge plates having each strain gauge are provided at four upper and lower and left and right positions around an outer periphery of the measuring wire 5 at the support positions. The wire presses the gauge plates and applies load thereto from a behavioral direction of the measuring wire. Strain amounts which the strain gauges of the loaded gauge plates show and the positions of the strain gauges to which the load is applied are detected, and the bending angles and the directions of the measuring wire at each support point are measured. The positions of the excavator and the plurality of the jacking pipes are measured by distances from each support point. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method and apparatus capable of grasping not only the position of the tip position but also the laying status of the subsequent pipe in real time in the propulsion method of the underground buried pipe. There are mainly suitable for position measurement in the propulsion method for small diameter pipes of 800 mm or less, particularly in the sharp curve propulsion method.

  This small-diameter pipe propulsion method involves excavating the ground with the excavator at the tip and connecting the propulsion pipes one after another behind the excavator and pressing the tail end of the propulsion pipe with the start-up shaft. It is a method of propelling straight or curved to the target position. In this construction method, whether or not the tip excavator and the subsequent propulsion pipe are propelling through the ground as planned, these positions are measured, and the ground is propelled while correcting the direction. In the case of linear propulsion, the target can be measured by irradiating the target on the back of the excavator from the starting shaft, and its position can be measured, but in recent years, the need for curve propulsion construction has increased dramatically. As the position measurement of such curve propulsion, the electromagnetic induction method is most established in the current implementation.

  In this electromagnetic induction method, the line of magnetic force generated by a transmitter installed in a propulsion head (rod) in the ground is measured by the ground receiver at the position where it is most strongly received to obtain a plane position. Then, the depth is calculated and processed. This method is a position measurement method that is generally used as an arc-shaped propulsion method (HDD-System) with a proven track record overseas, and the measurement method is simple and low cost. For measurement, it must go directly above the transmitter, it cannot be measured if there is a shield such as an embedded pipe between the transmitter and the receiver, the measurement accuracy is not very high, the measurement is only at the tip position In the middle, linear accuracy is unknown (it is possible by accumulating the survey results at the measurement point, but after propulsion, the rod restoring force works, a skid phenomenon occurs, and there is an error between the coordinates at the time of measurement and the actual laying position ), The measurement is performed at regular intervals, and there is a problem that the direction control cannot always be performed while reflecting the survey result.

  On the other hand, the combined measurement method of the tip rod bending amount measurement by the 3D bending sensor and the drilling locus by the chained drive gyro makes the orientation and posture of the arc propulsion method drill to solve the problems of the electromagnetic induction method. The system uses a sensor unit installed in close proximity, and has been miniaturized by the evolution of gyro fabrication technology, realizing extremely small and highly accurate position measurement with a diameter of 62 mm, and rod rotation It is a measurement structure that conforms to the construction method so that position measurement can sometimes be performed.

  However, even in this measurement method, the mechanical gyro device has a small diameter of 62 mm, but the length is 1925 mm, and the material thereof is also a rigid body. The gyro device location is the space inside the rod and the gyro device. From this condition, the minimum curvature is about 30 mR, and it is difficult to secure the curvature (10 mR) required in the sharply curved propulsion method. Also, in the curve propulsion, a force that returns to a straight line in the ground, called springback, is applied and a skid phenomenon occurs. In such a case, a large error occurs in the surveying accuracy. Moreover, since the measuring device is very expensive, it is the biggest factor that increases the construction cost.

Therefore, a plurality of surveying fixed points are set along a tunnel to be excavated at a predetermined distance, a surveying wire that is bent through the plurality of surveying fixed points is stretched, and a surveying fixed point is set at each surveying fixed point. The survey wire detector is rotated as the center, and the survey wire is detected at each surveying fixed point from the angle when the survey wire detector first detects the survey wire and the angle when the survey wire is detected next. A curve surveying method suitable for a small-diameter propulsion method has been developed, in which a bending angle is determined and the position of each surveying fixed point is determined from the folding angle and the predetermined distance.
Also. In the same way as above, a connecting line (wire) is passed through the propulsion pipe, the connecting angle between the front and rear connecting lines is measured with a connecting angle measuring instrument, and the inclined connecting angle generated by rolling of the propelling pipe is measured in the horizontal plane. The position of the digging machine is obtained from the sum of the x component of the joint and the sum of the y component of the joint from the joint angle and the joint length. A method for measuring the position of the excavator in the propulsion method has been developed.
JP-A-5-10758 JP 2003-97186 A

  However, in the former curve surveying method, a wire is passed through a small-diameter tube, the bending angle of the wire is determined at a surveying fixed point at a predetermined distance, and the position of each surveying fixed point is determined from the predetermined distance. It is suitable for small-diameter propulsion because it measures the position of the excavator at the tip, but the measurement of the wire bending angle at each surveying fixed point is planar and the angle bent three-dimensionally And the direction cannot be measured. Further, when the wire break angle is measured by the surveying wire detection means at each surveying fixed point, the surveying wire detection means must be moved to each surveying fixed point. Therefore, there is a drawback that it takes time and time for measurement. In addition, the latter method for measuring the position of the excavator is to determine the position of the excavator by complicated measurement using a connecting line and a connecting angle measuring device, and to measure the position of the entire propulsion pipe following the excavator. is not.

  The present invention has been made in view of these points. A wire is passed through a plurality of connected propulsion pipes, the wire is supported at predetermined intervals, and the wire is bent at each support point of these wires. A position measuring method for a propulsion method and an apparatus used therefor, which can measure the angle three-dimensionally and can immediately measure the position of each propelling pipe from the bending angle of each supporting point and the distance between the supporting points. It is intended to solve the above problems.

  Therefore, in the invention of claim 1, while excavating the ground with the excavator at the tip, the propulsion pipe is connected one after another to the rear of the excavator and the rear end of the propulsion pipe is pressed with the start shaft, In the method of propelling straight ahead or curving to the target position, one end is fixed near the rear of the excavator and the other end is passed through the propulsion pipes connected to the excavator along each propulsion pipe. A measuring wire tensioned by a tension device is provided in the shaft, and the measuring wire is supported at a plurality of positions within a propulsion pipe at a predetermined distance from the starting shaft, and each support of the measuring wire is used for the measurement. Supporting with a support that allows the wire to pass through, and providing a gauge plate having strain gauges in at least four locations around the outer periphery of the measurement wire at the support location, and depending on the behavior direction of the measurement wire, For the measurement The ear presses the gauge plate to apply a load, detects the strain amount indicated by the strain gauge of the gauge plate to which the load is applied, and the position of the strain gauge to which the load is applied, and detects the position of the measurement wire at each support point. Taking into account the tension, the bending angle and direction of the measuring wire at each support point are measured, and the position of the excavator and the plurality of propulsion pipes are measured from the distance of each support point. .

  According to a second aspect of the present invention, in the first aspect of the present invention, the tension of the measuring wire at each support point is determined from the starting shaft based on the tension value of the measuring wire measured at the starting shaft location. The position measurement method for the propulsion method calculates the tension value at each support point based on the distance to the support point.

  The invention of claim 3 is an apparatus for use in the method of the invention of claim 1 or 2, wherein one end is fixed near the rear portion of the excavator and the other end is connected to the excavator. A measuring wire that is tensioned by a tension device in the starting shaft through a plurality of propelling tubes is provided, and the measuring wire is supported at a position within the propelling tube at a predetermined distance from the starting shaft. And each support of the measurement wire is supported by a support fixed inside the propulsion tube, and each of these supports is provided with two flanges that are spaced apart by a plurality of spacers, facing each other, Two pipes are provided opposite to each other on the opposite inner surfaces of these flanges, and the tips of these pipes are spaced apart from each other at least at four locations around the outer periphery of the pipe. At a certain distance from the outer periphery of each tube. These gauge plates are supported by being passed between the two flanges, strain gauges are provided on the outer surfaces of these gauge plates, and the gap between the tips of the two tubes is centered. A disc having a hole is inserted, and the disc is surrounded by at least four gauge plates on the top, bottom, left, and right, but has a gap between the outer periphery of the disc and the inner surface of each gauge plate, The measurement wire is inserted from one tube having an opening in the one flange of the support, passes through the center hole of the disk, passes through the other tube, and is removed from the opening of the other flange. The measurement wire is slidable in the longitudinal direction in the central hole of the disc and in the tube, and the outer periphery of the disc is square in the direction perpendicular to the longitudinal direction. Within one of the gauge plates In addition, the support is provided with a rotation angle meter, and depending on the behavior direction of the measuring wire, the disk presses one or more of the gauge plates and applies a load. Detect the strain amount indicated by the strain gauge of the gauge plate to which the load is applied and the position of the strain gauge to which the load is applied, and take into account the tension of the measurement wire at each support point to determine the bending angle of the measurement wire. Measure the bending direction of the measuring wire from the position of the strain gauge where the load is applied in consideration of the inclination state of the vertical axis of the propulsion pipe measured and detected by the rotation angle meter, from the starting shaft to each support point The position measuring device for the propulsion method is used to measure the position of the excavating machine and the plurality of propulsion pipes from the distance.

  Further, in the invention of claim 4, the excavator is excavated in the ground with the excavator at the tip, and the propulsion pipe is connected to the rear of the excavator one after another, and the rear end of the propulsion pipe is pressed with the start shaft, In the method of propelling straight ahead or curving to the target position, one end is fixed near the rear of the excavator and the other end is passed through the propulsion pipes connected to the excavator along each propulsion pipe. A measuring wire tensioned by a tension device is provided in the shaft, and the measuring wire is supported at a plurality of positions within a propulsion pipe at a predetermined distance from the starting shaft, and each support of the measuring wire is supported by the propulsion A connecting body consisting of a horizontally long shaft having a flange in a supporting body fixed inside the tube is supported, and the measurement wire is divided at each supporting body portion, and these divided ends are connected to both ends of the connecting body. Connected to the support body in the support body. Strain gauges are provided at least at four locations on the outer circumference of the shaft on one side across the gap, and the measuring wire presses the strain gauge and applies a load depending on the behavior direction of the measuring wire, The strain amount indicated by the strain gauge under load and the position of the strain gauge under load are detected, the tension of the measurement wire is measured at each support point, and the bending angle and direction of the measurement wire at each support point are measured. The position measurement method for the propulsion method was used to measure the positions of the excavator and the plurality of propulsion pipes from the distances of the respective support points.

  The invention of claim 5 is the invention of claim 4, wherein the tension of the measurement wire at each support point is measured by measuring the tension of the measurement wire between the support points by a tension meter at each support point. The position measurement method for the propulsion method was used. The invention of claim 6 is an apparatus used in the method of the invention of claim 4 or 5, wherein each support of the measurement wire is in a support body fixed inside the propulsion tube. Insert a connecting body consisting of a horizontally long shaft having a flange in the center, and support it on the inner periphery of the supporting body with the flange, divide the measuring wire at the supporting point, and connect the dividing end parts to the connecting part. Connected at both ends of the body, strain gauges are provided at least at four positions on the upper and lower, left and right sides of the shaft on one side of the connecting body in the support body, and the shaft on the other side sandwiching the flange The propulsion method position measuring device provided with and supported by at least two tension meters and a rotation angle meter on the outer periphery of each. The invention according to claim 7 is the position measuring method according to any one of claims 1, 2, 4 and 5, wherein the pipe used for the propulsion method has a small diameter, and is a sharp curve propulsion method. A certain position measurement method for the propulsion method was used.

  According to the inventions of claims 1, 2, 4 and 5, the measurement wire is passed through the propulsion tube, and is provided around the outer periphery of the measurement wire or its connection body at a plurality of support points of the measurement wire. Since the bending angle and the bending direction of the wire are measured by the strain gauge, the position of the propulsion tube can be measured without taking up space in the propulsion tube. Moreover, it is possible to grasp not only the position of the leading excavator and the propulsion pipe but also the entire laying situation of the subsequent propulsion pipe. In addition, when the back of the propulsion pipe is pressed from the starting shaft to the loose part of the ground, the ground may not receive reaction force and the tip of the propulsion pipe may slide sideways. Therefore, the position of the entire propulsion pipe can be accurately detected. In addition, the bending angle and direction of the measuring wire at each support point can be measured three-dimensionally, and extremely accurate measurement can be performed. In addition, since the bending angle and direction of the measuring wire are measured at each supporting point whose distance from the starting shaft is known in advance, it is possible to measure simultaneously at each supporting point, and the positions of the excavator and the plurality of propulsion pipes can be determined. It can be measured immediately and in real time. Particularly, in the invention of claim 5, in order to measure the tension of the measuring wire at the corresponding point at each supporting point, if a computer is provided at the supporting point, the bending angle and direction of the measuring wire at that point Therefore, it is only necessary to derive the output wiring of the computer, and the wiring from each support point can be simplified.

  Further, in the inventions of claims 3 and 6, in addition to being able to measure the bending angle and direction of the measuring wire at each support point, by providing a rotation angle meter, the rolling state of the propulsion pipe having the support point can be changed. It can be detected, the bending direction of the measuring wire can be grasped more accurately, and the position can be measured with higher accuracy. The invention of claim 7 applies the position measuring method of claim 1, 2, 3 or 4 to the propulsion method of a small-diameter pipe, and the position of claim 1, 2, 3 or 4 The measuring method is particularly suitable for small-bore pipelines and sharp curve propulsion.

  While excavating the ground with the excavator at the tip, propulsion pipes are connected one after another behind the excavator and the rear end of the propulsion pipe is pressed by the start shaft, and propelled straight from the start shaft to the target position or curved In the construction method, one end is fixed near the rear part of the excavator and the other end is passed through the plurality of propulsion pipes connected to the excavator along the propulsion pipe so that tension is applied by a tension device in the start shaft. A measurement wire is provided, and the measurement wire is supported at a plurality of positions in the propulsion pipe at a predetermined distance from the starting shaft, and each support of the measurement wire is supported on the outer periphery of the disk through which the wire penetrates the center hole. A gauge plate provided with strain gauges is fixed at least at four positions on the top, bottom, left, and right, and the measurement wire that regulates the longitudinal movement of the measurement wire of the disk is controlled before and after the disk. Support with fixed through tube Is provided inside the propulsion tube, and a rotation angle meter is provided on the support. Depending on the behavior direction of the measurement wire, the disk pushes one or more of the gauge plates to apply a load, and the load is applied. Detect the strain amount indicated by the strain gauge on the gauge plate and the position of the strain gauge where the load is applied, measure the bending angle of the measurement wire taking into account the tension of the measurement wire at each support point, and rotate the rotation Measure the bending direction of the measuring wire in consideration of the state of rolling of the propulsion pipe (tilt of the vertical axis) with an angle meter, and determine the position of the excavator and the plural propulsion pipes from the distance from the starting shaft to each support point The position measurement method for the propulsion method was used.

The present invention will be described below with reference to the drawings.
FIG. 1 shows a schematic configuration diagram of a position measuring method for a propulsion method according to the present invention. First, as shown in FIG. 1, the propulsion method is performed by excavating the ground with the excavator 1 at the tip. A certain length of the propulsion pipe 2 is connected to the back of the pipe one after another, and the rear end of the propulsion pipe 2 is pressed by a pressing device 4 provided on the start shaft 3, and propelled straight from the start shaft 3 to a target position. It is a construction method. In the position measuring method used in this construction method, one end of the measuring wire 5 is fixed to the rear portion of the excavator 1, and the other end is placed in a plurality of succeeding propulsion pipes 2 substantially parallel to the respective propulsion pipes 2. Then, it is led out from the last propelling pipe 2 to the starting shaft 3 and a certain tension is applied to the measuring wire 5 by the tension device 6 in the starting shaft 3. The measurement wire 5 is supported at one end in each propulsion pipe 2. Each support of the measurement wire 5 is supported by the support body 7 supported on the inside of each propulsion tube 2 so as to be slidable in the longitudinal direction of the wire and swingable in a direction perpendicular to the longitudinal direction. 5 is configured such that the bending angle and direction of the measuring wire 5 are measured at these seven support members.

  2 and 3 are a partially cutaway perspective view and a longitudinal sectional view showing a specific example of the support 7. This support body 7 is provided with a plurality of spaced flanges 9 with a plurality of spacers 8 interposed therebetween, and two flanges 9, 9 having two same diameter pipes 10, 10 are provided opposite to each other, and the tips of the tube bodies 10 are spaced apart from each other by a certain distance, and at the vertical and horizontal positions of the tube bodies 10, 10, the gauge plate 11 is spaced apart from the outer periphery of the tube bodies 10 by a certain width. These four gauge plates 11 are passed between and supported by the two flanges 9 and 9. A strain gauge 12 is provided on each outer surface of these gauge plates 11. Further, a disc 13 having a center hole 13a is inserted into the gap between the ends of the tubular bodies 10 and 10, and the disc 13 is surrounded by the four gauge plates 11. There is a gap between the outer periphery and the inner surface of each gauge plate 11. A rotation angle meter 18 is provided on one of the spacers 8.

  The measurement wire 5 is inserted from one tube 10 having an opening in the one flange 9 of the support 7, passes through the central hole 13 a of the disk 13, and passes through the other tube 10. The other flange 9 is pulled out from the opening. Accordingly, the measuring wire 5 is inserted through the center hole 13a of the disk 13, but is slidable in the longitudinal direction, and the outer periphery of the disk 13 is not perpendicular to the surface direction perpendicular to the longitudinal direction. It is movable until it hits one of the inner surfaces of the four gauge plates 11.

  Therefore, when the two connected propulsion pipes 2 are bent with respect to one side, the measuring wire is bent, and the disc 13 presses one or a plurality of gauge plates 11 according to the behavior direction to apply a load. The strain gauge 12 of the loaded gauge plate 11 is distorted. Therefore, the strain amount indicated by the strain gauge 12 and the position of the strain gauge 12 to which a load is applied are detected. The bending angle of the measuring wire 5 is to be detected based on the strain amount of the strain gauge 12, but this strain amount varies depending on the tension of the measuring wire 5. Therefore, the relationship between the tension value and the strain amount of the strain gauge is calculated in advance. And the tension | tensile_strength of the measurement wire 5 of the said support body 7 location is measured. Since the length of each propulsion pipe 2 is determined, the length of the measurement wire 5 from the start shaft 3 to the support 7 can be known. Moreover, the tension value Ft of the measurement wire 5 is measured at the start shaft 3. Based on this tension value Ft, the value attenuated by the distance to each support 7 is calculated, and the tensions Fθ1, Fθ2, Fθ3 of each support 7 shown in FIG. 1 are obtained, and these obtained Fθ are used as the basis. Thus, the bending angles θ1, θ2,... Θn of the measuring wire 5 at each of the seven support members can be obtained by calculation from the strain amount of the strain gauge 12.

  In addition, the bending direction can be detected from the position of the strain gauge 12 to which the load is applied. At this time, since the rotation angle meter 18 is provided on the support 7, the rolling state of the propulsion tube 2 of the support 7 can be known, and the position of the strain gauge 12 subjected to the load can be corrected. Further, the distance to each support point (support 7) can be calculated because the length L of the propulsion pipe 2 is known as described above. As a result, the folding angle and direction at each support point and the distance from the start shaft 3 to each support point can be known, so that the propulsion coordinates can be calculated and estimated. In this embodiment as well, a tension meter is provided for each of the seven support members to measure the tension of the measurement wire 5 at the corresponding location, and the bending angle is determined from the strain amount of the strain gauge 12 based on the tension value. It can also be measured.

  FIG. 4 is a side view showing another specific example of the support 7. The support body 7 'is inserted into a support tube body 16 fixed to the inner periphery of the propulsion tube 2, and a connecting body 15 comprising a horizontally long shaft having a flange 15a at the center is inserted, and the flange 15a is inserted into the support tube body. 16 is slidably supported on the inner periphery of 16, the measurement wire 5 is divided at the support point, and these divided ends are connected at both ends of the connection body 15, so that the connection body in the support tube body 16 is connected. 15, strain gauges 12 are provided at four locations on the outer circumference of the shaft on one side across the flange 15a, and two on the opposite surfaces of the outer circumference of the shaft on the other side across the flange 15a. A tensile force detection strain gauge 17 is provided, and a rotation angle meter 18 is provided on the outer periphery of the other shaft.

  This support 7 'is connected to the start shaft 3 side on the left side of FIG. 4 and to the excavator 1 side on the right side. When the propulsion pipe 2 on the front side of the excavator 1 is bent, the measuring wire 5 is bent, and the following. One side of the connecting body 15 having the strain gauge 12 sandwiching the flange 15a is distorted, and one or more strain gauges 12 of the strain gauges 12 on the top, bottom, left and right are distorted. Thus, the strain amount and strain position of the strain gauge 12 which has been distorted are detected, and measured with the tensile force detection strain gauge 17 on the other side of the connection body 15 sandwiching the flange 15a. In consideration of the tension value between them, the bending angle and direction of the measuring wire 5 at the location of the connecting body 7 'are detected. Further, the rotation state of the propulsion pipe 2 can be detected by the rotation angle meter 18, and the propulsion coordinates can be calculated and estimated based on the distance, the angle and the direction, based on the distance between the support shaft 7 ′ from the start shaft 3. . Further, if the tension value of the measurement wire 5 and the strain amount of the strain gauge are detected at each support 7 ′ position and a computer is provided at the support point position (not shown), the measurement wire is located at that position. 5 bend angles and directions can be measured, so only the output wiring of the computer need be derived.

  FIG. 5 shows a cross-sectional view of an actual apparatus used for position measurement according to the present invention. Each casing pipe 20 having a small diameter is inserted into each propulsion pipe 2, and each casing pipe 20 has a plurality of positions on the outer periphery. A guide roller 21 provided on the inner surface of each propulsion pipe 20 is rotatably abutted and supported. The measurement wires 5 are passed through the casing tubes 20, and the measurement wires 5 are supported by a support 7 provided in the casing tubes 20. Further, the excavator 1 is supported and fixed at the tip of the leading propulsion pipe 2 (not shown), and the rotary shaft (not shown) of the excavator 1 is formed by a rotating rod 22 rotatably provided in the casing pipe 20. Connected to the tip, the base end of the rotary rod 22 is connected to a hydraulic rotary motor (not shown) in the start shaft 3. In the figure, 22a is a water injection pipe, 23 is a mud drainage hose excavated by the excavator 1, 24 is a lubricant supply hose, 25 is a hydraulic hose for direction correction, 26 is a wire-type measuring instrument data processing unit, 27 Is a wire-type measuring instrument data link cable, and 28 is an auxiliary measuring device such as an inclinometer.

  In the above embodiment, one end of the measurement wire is fixed to the rear part of the engraving machine 1, but the present invention is not limited to this, and the front end part of the leading propulsion pipe 2 or the front end part of the leading casing pipe 20, etc. It may be in the vicinity of the rear part of the machine 1. Moreover, in the said Example, although the gauge plate 11 or the strain gauge 12 which has the four strain gauges 12 is provided in the circumference | surroundings or the outer periphery of the axis | shaft of the measurement wire 5 or the connection body 15 or the outer periphery, In addition, a gauge plate 11 having a strain gauge 12 or a strain gauge 12 may be inserted between them to make a total of 8 or 16 sheets. The number of gauge plates 11 or strain gauges 12 having these strain gauges 12 may be four or more. In the above embodiment, two tensile force detection strain gauges 17 of the support 7 ′ are provided on opposite surfaces. However, the tensile force detection strain gauges 17 are four, six, and eight to increase accuracy. An even number of gauges may be provided. Furthermore, instead of this tensile force detection strain gauge, another appropriate tension meter may be used.

It is a schematic block diagram of the method of this invention. It is a partial notch perspective view of the support body used for the method of this invention. It is a longitudinal cross-sectional view of the support body used for the method of this invention. It is a side view which shows the other example of the support body used for the method of this invention. It is sectional drawing of the actual apparatus used for the method of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Excavator 2 Propulsion pipe 3 Starting shaft 4 Pressing device 5 Measuring wire 6 Tension device 7 Support body 7 'Support body 8 Spacer 9 Flange 10 Tube body 11 Gauge plate 12 Strain gauge 13 Disc 13a Center hole 15 Connection body 15a Flange DESCRIPTION OF SYMBOLS 16 Support pipe body 17 Tensile-force detection distortion gauge 18 Rotation angle meter 20 Casing pipe 21 Guide roller 22 Rotating rod 22a Water injection hose 23 Drainage hose 24 Lubricant supply hose 25 Direction correction hydraulic hose 26 Wire type measuring device data processing part 27 Wire Type measuring instrument data link cable 28 Auxiliary measuring device such as inclinometer

Claims (7)

While excavating the ground with the excavator at the tip, propulsion pipes are connected one after another behind the excavator and the rear end of the propulsion pipe is pressed by the start shaft, and propelled straight from the start shaft to the target position or curved In this construction method, one end is fixed in the vicinity of the rear part of the excavator and the other end is passed through the plurality of propulsion pipes connected to the excavator along each propulsion pipe and tension is applied by a tension device in the start shaft. The measurement wire is provided, and the measurement wire is supported at a plurality of positions in the propulsion pipe at a predetermined distance from the start shaft, and each support of the measurement wire is supported by a support body through which the measurement wire is allowed to pass. In addition, a gauge plate having strain gauges is provided in at least four locations around the outer periphery of the measurement wire at the support portion, and the measurement wire is connected to the gauge plate according to the behavior direction of the measurement wire. Press and apply a load, detect the strain amount indicated by the strain gauge of the gauge plate to which the load is applied and the position of the strain gauge to which the load is applied, taking into account the tension of the measurement wire at each support point, A position measuring method for a propulsion method, characterized by measuring a bending angle and a direction of a measuring wire at each support point, and measuring positions of the excavator and the plurality of propulsion pipes from a distance between the support points. The tension of the measurement wire at each support point is calculated based on the distance from the start shaft to each support point based on the tension value of the measurement wire measured at the start shaft location. The position measuring method for propulsion method according to claim 1, characterized in that it is characterized in that A measuring wire in which one end is fixed near the rear portion of the excavator and the other end is passed through the plurality of propulsion pipes connected to the excavator along the propulsion pipe and is tensioned by a tension device in the start shaft. The measurement wire is supported at a position in the propulsion pipe at a predetermined distance from the start shaft, and each support of the measurement wire is supported by a support fixed inside the propulsion pipe. Is provided with two flanges that are spaced apart by a plurality of spacers so as to face each other, and two pipes are provided opposite to each other on the opposite inner surfaces of these flanges. Gauge plates are provided at a fixed distance from each other and at a distance of a predetermined width from the outer periphery of each tube at least at four locations around the outer periphery of the tube. Passed in support A strain gauge is provided on each outer surface of these gauge plates, and a disc having a center hole is inserted into the gap between the tips of the two tubular bodies. The disc has four gauges on the upper, lower, left and right sides. One tube that is surrounded by a plate but has a gap between the outer periphery of the disk and the inner surface of each gauge plate, and the measurement wire has an opening in the one flange of the support. Is inserted through the center hole of the disk, passes through the other tube body, and comes out from the opening of the other flange, and the measurement wire is connected to the center hole of the disk and the tube body. In the surface direction perpendicular to the longitudinal direction, the disk can move until the outer periphery of the disk hits one of the inner surfaces of the four gauge plates. A rotation angle meter is provided on the support, and the above measurement is performed. Depending on the behavior direction of the wire, the disk presses one or more of the gauge plates to apply a load, the strain amount indicated by the strain gauge of the gauge plate to which the load is applied, and the position of the strain gauge to which the load is applied Measure the bending angle of the measurement wire in consideration of the tension of the measurement wire at each support point, and consider the inclination state of the vertical axis of the propelling tube detected by the rotation angle meter The bending direction of the measurement wire is measured from the position of the strain gauge to which the load is applied, and the positions of the excavator and the plurality of propulsion pipes are measured from the distance from the starting shaft to each support point. A position measuring device for propulsion method used in the method according to claim 1 or 2. While excavating the ground with the excavator at the tip, propulsion pipes are connected one after another behind the excavator and the rear end of the propulsion pipe is pressed by the start shaft, and propelled straight from the start shaft to the target position or curved In this construction method, one end is fixed in the vicinity of the rear part of the excavator and the other end is passed through the plurality of propulsion pipes connected to the excavator along each propulsion pipe and tension is applied by a tension device in the start shaft. A measuring wire is provided, and the measuring wire is supported at a plurality of positions in the propulsion pipe at a predetermined distance from the start shaft, and each support of the measuring wire is provided in a support body fixed inside the propulsion pipe. A connecting body consisting of a horizontally long shaft having a flange is supported, the measuring wire is divided at each supporting body portion, and the divided end portions are connected at both ends of the connecting body. A shaft on one side across the flange Strain gauges are provided at least at four locations on the outer circumference, up, down, left, and right, and depending on the behavior direction of the measurement wire, the measurement wire presses the strain gauge and applies a load, and the strain amount indicated by the strain gauge applied with the load The strain gauge position where the load is applied is detected, the tension of the measurement wire is measured at each support point, the bending angle and direction of the measurement wire at each support point are measured, and the distance from each support point is measured. A position measuring method for a propulsion method, characterized by measuring positions of the excavator and the plurality of propulsion pipes. 5. The propulsion method according to claim 4, wherein the tension of the measurement wire at each support point is determined by measuring the tension of the measurement wire between the support points with a tensiometer at each support point. Position measurement method. Each support of the measurement wire is inserted into a support body fixed inside the propulsion tube, and a connecting body consisting of a horizontally long shaft having a flange in the center is inserted and supported by the flange on the inner periphery of the support body. The measurement wire is divided at the support point, the cut ends are connected at both ends of the connection body, and the connection body in the support body is at least above and below the outer circumference of the shaft on one side across the flange. The strain gauges are provided at four locations on the left and right sides, and at least two tension meters and rotation angle meters are provided and supported on the outer periphery of the shaft on the other side across the flange. The position measuring device for propulsion method according to 4 or 5. The position measuring method for a propulsion method according to any one of claims 1, 2, 4 and 5, wherein the pipe used for the propulsion method has a small diameter and is a sharp curve propulsion method.